Our country has entered the 5G rapid development era, 5G communication is more mature in the industrial technology field, and the large-scale construction 5G communication base station is in order. With the completion of the 5G base station construction, the 5G base station will necessarily be inevitable. The electromagnetic radiation problem of 5G base station accompanying is also clear. To this end, "HJ1151-2020 5G Mobile Communication Base Electromagnetic Radiation Environment Monitoring Method" was drafted by the National Ecological Environmental Protection Department, China Communications, National Wireless Monitoring Center (Trial), officially implemented from March 1, 2021. In order to facilitate third-party detection companies to better carry out the 5G communication base station electromagnetic radiation testing business, our (national test electronics) has made a simple standard interpretation.
1. Changes of standards
HJ1151-2020 replaces the HJ972-2018, the HJ972-2018 standard invalidation.
HJ1151-2020, explicitly 5G base station, no 2G / 3G / 4G, but HJ1151 replaces HJ972, indirectly indicates that 2G / 3G / 4G measurement follows this standard.
2. Scope of measurement
It is basically consistent with the HJ972 description, gives an electromagnetic radiation sensitivity target (usually working, living area)
Added industrial application scenarios (car network, smart medical, industrial applications, etc.)
3. Instrument requirements
3.1 The new standard is clear, the selection of the SET-based electromagnetic radiation monitoring equipment should be selected (electromagnetic radiometer with spectrum analysis function)
3.2 SETF Instrument Test Mode: Tinral root (RMS), mean (AVG) within 6 minutes; (measurement instrument's scanning method with RMS function and AVG function)
3.3 When the instrument is measured, the downlink band of the base station should be selected (see if the specific frequency can be found :)
3.4 When multiple base stations or different base stations in the environment, the list mode of the instrument is applied, and the field strength data of different base stations is read. (Use the multinort function of the SALS instrument to mark field strength data generated by different frequencies of different base stations)
3.5 Probes (antenna) equipped with instruments, can use full-to-direction (isotropic) or non-full (orientation)
Alignment of the antenna). When using a non-full antenna, consider the directionality of the antenna, it is necessary to move antenna until the instrument has the largest field strength.
3.6 The bracket of the instrument should select a non-conductive bracket (5G base station frequency, non-conductive bracket and human hand)
The equipment has little effect on the measured value, and the power frequency electric field has very much)
3.7 Measuring the basic performance requirements of the instrument
4. Requirements for measurement methods
Basic information (name, carrier, location, frequency, antenna number, etc.)
5. Measurement of cloth points, height
Measurement principle: Measure the harm to the human body, so choose the area where you often actually active
Surroundings: living, office, learning and other environmental measurements
The surrounding antenna: The measurement sector is performed in the emission surface of the antenna, and the sectors are measured in both sides, and the distance from 5-50m is more (how many meters into progress should be determined according to the site)
Height: The head position should be taken when the body is squat; when standing, the abdomen, the chest, the head is tall.
6. Measurement results: The measurement unit shows the power density (W / m2) or V / m conversion.
7. Measurement evaluation: Measurement comparison GB8702-2014 standard (40UW / cm2 @ 30m-3g) (3-5g
Pay attention to frequency changes)
l During the measurement process, it should be considered whether there is signal interference problem.
According to the relevant requirements of the electromagnetic radiation environment monitoring method of the mobile communication base station, our company sells the German Annoni Aaronia SET-based electromagnetic spectrum analyzer HF-60105 can meet its performance requirements, and the price is affordable, and the specific performance is as follows:
1. Frequency satisfaction: 1MHZ-9.4G
2. The inspection method is satisfied: RMS / AVG
3. Work mode is met: SET
4. Probe (antenna) is satisfied: non-full (for several cycles antenna)
5. Multi-base station satisfaction: multi-cursor, mark the field strength at different base stations frequencies
6. Measuring unit satisfaction: Multi-unit can switch v / m, W / m2, W / cm2
7. Measurement time is satisfied: 6-minute average, average scanning track, multi-point optical standard and time axis
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